And please, please, please say I was very close in the riddle when I said the children are training their spatial imagination!!!! ;D ;D ;D

Hmmm....

Look, Livio, I must say this: we, males, like putting and receiving things in a straightforward, matter-of-fact way. If you said directly, without beating about the bush, that the kids were trying to build some construction with giant quadrilateral-shaped cubes made of sponge and canvas, I could acknowledge it.

But this spatial imagination was too general, too far from the mainstream of events in that interactive hall of the museum.

I fully understand you, as a gentle woman you prefered to be delicately unprecise, not to hurt anybody`s feelings.